3,5-dioxo-2,3,5,6-tetrahydro-(4h)-pyrane and thiopyrane-4-carboxanilides

ABSTRACT

DISCLOSED ARE COMPOUNDS OF THE CLASS OF 3,5-DIOXO-2-3, 5,6-TETRAHYDRO-(4H)-PYRANE AND -THIOPYRANE-4-CARBOXANILIDES E.G. 3,5-DIOXO-2,3,5,6-TETRAHYDRO-(4H)-THIOPYRANE-4CARBOXANILIDE, FOR EXAMPLE, AS ANTI-INFLAMMATORY AND ANTI-FUNGAL USEFUL, FOR EXAMPLE, AS ANTI-INFLAMMATORY AND ANTI-FUNGAL AGENTS. THE COMPOUNDS MAY BE PREPARED BY REACTING 3,5DIOXO-2,3,5,6-TETRAHYDRO-(4H)-PYRANE OR THIOPYRANE WITH A PHENYL ISOCYANATE IN THE PRESENCE OF A BASE.

Patented Sept. 3, 1974 ,1 .3,5-DIOX-2,3,5,6-TETRAHYDRO-(4H)-PYRANE AND THIOPYRANE-4-CARBOXANILIDES Goetz E.'H'ardtmann, Florham Park, N.J., assiguor to Sandoz-Wander,lnc., Hanover, NJ.

No Drawing. Continuation-impart of abandoned application"Ser-.No' 246,351,"Apr. 21, 1972. This application Mar. 5, 1973, Ser. No. 338,302

9 Claims ABSTRAIIT (mine DISCLOSURE Discloseda're compounds of the class of 3,5-dioxo-2,3, 5,6-tetrahydro- ('4H)-'-pyrane andv -thiopyrane-4-carboxani lides e.g. 3,5-dioxo12,3,5,6-tetrahydro-(4H)-thiopyrane-4- carboxanilide, which exhibit biological activity and are useful, for example, as anti-inflammatory and anti-fungal agents. The,cornpounds may .be prepared by reacting 3,5- dioIx' o-2,3,5,6-tetrahydro-(4H)-pyraue or thiopyrane with a phenyl isocyanate in the presence of a base.

This application is a continuation-in-part of copending application Ser. No. 246,351, filed Apr. 21, 1972, now abandoned.

The invention relates to chemical compounds which are 3,5-dioxo-2,3,5,6-tetrahydrd(4H)-pyrane and thiopyrane- 4-carboxanilides, to the preparation of said compounds and the r nethods and compositions utilizing the biologicallactivities'of such, compounds.

The compounds of ,the invention may be represented by the following structural formula I:

in which X is oxygen of sulfur and each of R and R is independently hydrogen, halo of atomic weight of from 18 to 80, i.e. fluoro, chloro or bromo, lower alkyl of 1 to 4 carbon atoms, lower alkoxy of 1 .to '4 carbon atoms, trifluoromethyl or nitro, provided that .R and. R may not both be a tertiary branched ,substituent.

T hecdmpounds ofthe Formula Imay be conveniently prepared by reacting'acoinpoundof the Formula II:

V O 'O in which X is as above defined, with a compound of the Formula III; I

I o=o=N- a R in which R and R areas above defined.

III

be also used. The reaction product of the Formula I may be isolated and recovered from the resulting reaction mixture by working up by conventional procedures.

The compounds of the Formula II and III are either known per se or may be prepared from known materials by established procedures. A suitable literature reference for compounds of the Formula II is J.A.C.S. 77, 4241 (1955).

The compounds represented by formula I above are useful as antimocribal agents, i.e. as anti-bacterial and anti-mycotic agents, as indicated by their activity at concentrations of 1 to micrograms/ml. in vitro against the organisms Staphylococcus aureus, Salmonella typhimurium, Escherichia coli, Proteus vulgaris, Candida, albicans, and Beta hemolyticus streptococcus Lancefield group A using conventional serial dilution tests. Particularly potent effects are shown by the compound of Example 1 hereinafter against candida albicans, e.g. effective concentrations can be as low as 3-l5 micrograms per milliliter.

For use in the treatment of microbial infection the compounds I may be administered orally, parenterally or topically, as such or admixed with conventional pharmaceutical carriers.

The anti-micorbial effective dosage utilized in the treatment of microbial infection will vary depending upon the compound employed, the condition being treated, and the mode of administration. In general, satisfactory results are obtained when the compounds of the formula I are administered internally for systemic use at a daily dosage of about 0.5 mg. to about 100 mg. per kilogram of animal body weight. This daily dosage is preferably administered 2 to 4 times a day, or in sustained release form. For most large mammals the total daily dosage is from about 30 mg. to about 4 gm. Dosage forms suitable for internal use comprise about 7 mg. to about 2.0 g. of active compound in intimate admixture with a solid or liquid pharmaceutically acceptable carrier or diluent.

The compounds I except those in which R and R are nitro or trifluoromethyl are also useful as anti-inflammatory agents as indicated by an inhibition of Carrageenan induced edema in rats and a reduction in foot volume and an improvement in grip strength in the adjuvant arthritis test in rats using Mycobacteria butyricum in Freunds adjuvant, both on oral administration (15-150 mg./kg.). For such use, the compounds may be combined with a pharmaceutically acceptable carrier, and such other conventional adjuvants as may be necessary, and administered orally or parenterally in a conventional manner. The dosage administered will, of course, vary depending upon the compounds used, the severity of the condition being treated, and the mode of administration. However, in general, satisfactory results are obtained when administered at a daily dosage of from about 3.0 milligrams to about in which R is halo of atomic weight of from 35 to 80 or trifiuoromethyl' and in which X is as above defined, are also useful as hypolipidemic agents, i.e. in the treatment of lipidemia, as indicated by tests on a group of white rats which are given typically 10-200 mg. per kg. of body weight per diem of the compound orally, for six days, followed by extraction with isopropanol of serum or plasma after anesthetizing the rats with sodium hexobarital, and then noting the cholesterol and triglyceride contents which are lowered compared to those of a control group. The cholesterol and triglyceride contents are determined by the methods described by Lofland, H. B., Anal. Biochem. 9:393 (1964): (Technicon method N 24a): and Kessler, G., and Lederer, H. Technicon Symposium, Mediad Inc., New York, pages 345-347 (1965), respectively. For such usage, the compounds may be administered orally as such or admixed with conventional pharmaceutical carriers. The dosage administered may vary depending on the particular compound employed, the therapy desired and the severity of the condition being treated. In general, satisfactory results are obtained when administered orally at a daily dosage of from about 1 milligrams to about 200 milligrams per kilogram of animal body weight, preferably given in divided doses, 2 to 4 times a day, or in sustained release form. For most mammals the total daily dosage is from about 80 milligrams to about 1500 milligrams of the compound, and the dosage forms suitable for internal use comprise from about 20 milligrams to about 750 milligrams of the compound in intimate admixture with a solid or liquid pharmaceutically acceptable carrier or diluent.

For above usages, the compounds I may be administered orally in such forms as tablets, dispersible powders, granules, capsules, syrups, and elixirs; parenterally as solutions, suspensions, dispersions, emulsions, and the like, e.g., a sterile injectable solution such as an aqueous suspension and topically as solutions, salves and the like. These pharmaceutical preparations may contain 0.5% up to about 90% of the active ingredient in combination with the carrier or adjuvant, more usually between 3% and 50% by weight. Such compositions may be prepared according to any method known in the art for the manufacture of pharmaceutical compositions, and such compositions may also contain one or more conventional adjuvants, such as sweetening agents, flavoring agents, coloring agents and preserving agents, in order to provide an elegant and palatable preparation.

Tablets and capsules containing the ingredients indicated below may be prepared by conventioned techniques and are useful in treating microbial infection and inflammation in mammals at a dose of one tablet or capsule 2 to 4 times a day.

Weight (mg.)

Ingredients Tablet Capsule 3, b-dioxo-Z, 3, 5, 6-tetrahydro-(4H)-thiopyrane-4- earboxanillde 100 100 Trmmnanth 10 "Lactose 197, 250 Corn starch 25 Talnnm 15 Magnesium steal-ate 2. 5

Weight (mg.) sterile injectable suspension 3,5 dioxo 2,3,5,6 tetrahydro-(4H)-thi0pyrane-4- carboxanilide Sodium carboxy methyl cellulose U.S.P. 1.25 Methyl cellulose .4

Capsules containingt'he ingredients ind'icated below may be prepared by conventional techniques and are u'se-" ful in treating lipidemia in mammals on administration of one capsule 2to 4 timesa day Weight; (mg) Ingredients: I I

3,5 dioxo 2,3,5,6-tetrahydro-(4H)-thiopyrane 4 m trifluoromethylcarboxanilide '100. Lactose 250 It will be evident to those skilled in "the art that the" compounds of the formula I offthe'invention may have and may be expressed mula IA:

encompassed within the scope of this invention. and the. manner in which such compounds are prepared. However,

it is to be understood that the examples are forpurposes of illustration only.

EXAMPLE 1 3,5-Dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-carboxanilide A mixture of 5.5 g.-of 3,5-Dioxo 2,3,5,6-tetrahydro- (4H)-thiopyrane, 5.2 g. of phenyl-isocyanate and-4.6g. of triethylamine is heated in mhoftetrahydrofuran for 2 hours under reflux. After cooling the mixture is poured over 700 ml.of'2N hydrochloric"acid andthe oil which separates is crystallized by scratching. The'crys talline material is filtered off, the filter residue washed 3 times with ml. of water and dried by suction. The crude crystalline material is dissolved about 50 ml. of methylene chloride and filtered through a short silica gel Column. The material is eluted with chloroform-methanol (98:2). Following'evaporatidn the residual oil is crys-. tallized from methylene chloride/ethanol (1:5) to ob tain 3,5 dioxo-2,3,5,6 tetrahydro-(4H) -thiopyrane-4-carboxanilide, mp. 83-85 C.

EXAMPLE 2 by the alternate structural for- (D) 3,5-dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-p-methoxycarboxanilide.

(E) 3,5-dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-m-methylcarboxanilide.

(F) 3,5-dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-p-fluorocarboxanilide, mp. 115-118" C.

(G) 3,S-dioxo-Z,3,5,6-tetrahydro-(4H)-thiopyrane- 4-m-chlorocarboxanilide, m.p. l15118 C.

(H) 3,5-dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-p-methy1carboxani1ide, mp. 85-89 C.

(I) 3,5-dioxo-2,3,S,6-tetrahydro-(4H)-thiopyrane- 4-m-methylcarboxanilide.

(J) 3,5-dioxo-2,3,5,6-tetrahydro-(4H) -thiopyrane- 4-o-trifluoromethylcarboxanilide, m.p. 94-97 C.

(K) 3,5-dioxo-2,3,5,6-tetrahydro-(4H)-thiopyrane- 4-o,p-dimethoxycarboxanilide, m.p. 171174 C.

EXAMPLE 3 3 ,5 -dioxo-2,3 ,5 ,6 -tetrahydro- (4H -thiopyrane-4-mtrifluoromethylcarboxanilide A solution of 8 g. of thiopyrane-1,3-dione dissolved in 100 m1. of tetrahydrofuran is treated with 11.7 g. of m-trifluoromethyl-phenylisocyanate and 7 g. of triethylamine and the mixture is refluxed for 3 hours. After cooling the mixture is poured on 200 ml. ice cold 2N hydrochloric acid and the precipitate which forms is filtered OE and washed (on the filter) 3 times with water. The filter residue is dried by air-suction and then dissolved in 200 ml. of methylene chloride. The solution is subsequently dried over Na SO treated with activated charcoal, filtered and evaporated to 50 ml. volume. On exchange of the solvent by ethanol crystallization occurs and the product is removed by filtration, the filter residue washed once with ethanol and twice with pentane and dried to obtain 3,5-diox0-2,3,5,6-tetrahydro-(4H)-thiopyrane-4-m-trifluoromethylcarboxanilide, mp. 81-84 C,

What is claimed is:

1. A compound of the formula:

R H 0 U in which X is oxygen or sulfur and each of R and R is independently hydrogen, halo of atomic weight of from 18 to 80, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, trifluoromethyl or nitro, provided that R and R may not both be a tertiary branched substituent. 2. A compound of claim 1 in which X is sulfur. 3. The compound of claim 2 in which each of R and R is hydrogen.

4. The compound of claim 2 in which R is chloro and R is hydrogen.

5. A compound of claim 1 in which X is oxygen. 6. The compound of claim 5 in which each of R and R is hydrogen.

7. A compound of claim 1 in which each of R and R is independently hydrogen, halo, alkyl or alkoxy in the metaand para-positions.

8. A compound of claim 1 having the formula:

RB 01 O X in which R is halo of atomic weight of from 35 to or trifluoromethyl.

9. The compound of claim 8 in which X is sulfur.

References Cited FOREIGN PATENTS 1,111,542 5/1968 Great Britain 260327 771,060 2/1972 Belgium 260557 JOHN D. RANDOLPH, Primary Examiner C. M. S. JAISLE, Assistant Examiner US. Cl. X.R. 

